IPv4 Subnet Calculator & CIDR Range Analyzer
Calculate network address, broadcast, netmask, wildcard mask, and usable host count from any IPv4 CIDR.
About This Tool
IPv4 Subnet Calculator helps network engineers and cloud architects plan and partition IP networks, computing network IDs, broadcast addresses, wildcard masks, usable host ranges, and binary representations.
Key Features
Supports all CIDR prefixes from /1 to /32
Calculates Network, Broadcast, First Usable, and Last Usable host IPs
Displays Wildcard Mask, Netmask Hex, and Binary representations
Identifies RFC 1918 Private vs Public IP addresses
How to Use This Tool
- Enter an IPv4 address (e.g. 192.168.1.150).
- Select the CIDR prefix (e.g. /24, /16, /28).
- Review network address, broadcast, usable host range, and wildcard mask.
Why Use This Tool
- Indispensable for AWS VPC subnetting, Kubernetes cluster network design, and local network configuration.
- Zero-latency calculation with complete subnet classification diagnostics.
Pro Tips
- For AWS VPC subnets, AWS reserves 5 IP addresses per subnet (/28 gives 11 usable IPs instead of 14)
Frequently Asked Questions
Why is the usable host count 2 less than total addresses in a subnet?
In standard IPv4 subnets, the first address is reserved as the Network Address and the last address is reserved as the Broadcast Address.
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